I'm guessing someone uploaded your subtitle as "anonymous" and then someone reported it as yours (maybe you yourself), therefore an admin took action (explosiveskull) and put it in your name.
Below is a guide how you can make/send reports for admins to see and take action for situation like this one:
https://forum.opensubtitles.org/viewtop ... f=1&t=2595
Above guide can also be used to remove your own uploader name or to add your name as uploader to an anonymous sub.
If the subtitle has been uploaded by a registered user, then the name of that user will not be changed to yours without a very good reason. So the best thing to do is to upload your work here before others do.
In regards to the title of the thread, "Subtitle Uploaded Automatically".
Some users use programs to download and upload subtitles automatically, so someone can use a program to upload your subs here automatically, but not on your name.